Android SDK Flutter

Flutter is an open-source mobile application development framework created by Google. It is used to develop Android, iOS, Windows, Mac, Linux, and web applications using a single codebase.

Getting Started with Flutter

To develop apps using Flutter, you need the following:

• Flutter SDK
• Android Studio or VS Code
• Android SDK

Installing Flutter SDK

To install the Flutter SDK, follow the below steps:

1. Download the Flutter SDK from the official website (https://flutter.dev/docs/get-started/install).
2. Extract the downloaded file to a suitable location.
3. Add the Flutter bin directory path to your system path.

Setting up Android Studio or VS Code

To set up your IDE, follow the below steps:

1. Download and install Android Studio or Visual Studio Code.
2. Install the Flutter and Dart plugins in your IDE.
3. Configure the paths for the Flutter SDK and Android SDK in your IDE.

Creating a Flutter Project

To create a new Flutter project, run the below command:

flutter create my_project_name

You can also create a Flutter project using the Android Studio New Project wizard.

Flutter Widgets

Flutter provides various types of widgets to develop UI for your app. There are two types of widgets in Flutter:

1. StatelessWidget: These widgets are immutable and do not change their properties. Examples include Text, Icon, and Image.

2. StatefulWidget: These widgets maintain their states throughout the lifecycle of the widget. Examples include Checkbox, Radio, and Switch.

Container Widget

The Container widget is used to create a UI container in Flutter. It provides properties like padding, margin, color, and alignment to customize the container. Below is an example of using the container widget:

Container(
  margin: EdgeInsets.all(10.0),
  padding: EdgeInsets.all(12.0),
  alignment: Alignment.center,
  decoration: BoxDecoration(
    color: Colors.red,
    borderRadius: BorderRadius.circular(10.0),
  ),
  child: Text(
    "Hello, world!",
    style: TextStyle(fontSize: 24.0),
  ),
);

ListView Widget

The ListView widget is used to create a scrollable list in Flutter. It provides properties like builder, separator builder, and scroll controller to build the list as per requirement. Here is an example of using the ListView widget:

ListView.builder(
  itemCount: 10,
  itemBuilder: (BuildContext context, int index) {
    return ListTile(
      title: Text("Item ${index + 1}"),
      subtitle: Text("This is a subtitle."),
      leading: Icon(Icons.people),
      trailing: Icon(Icons.arrow_forward),
      onTap: () {},
    );
  },
);

Conclusion

Flutter is one of the best SDKs for developing cross-platform mobile applications. It provides a wide range of widgets and tools to enhance the development experience. With its high-performance rendering engine and Hot Reload feature, Flutter has become a popular choice among developers.